Is the 750 gear Grove or another brand?

Views: 641

Reply to This

Replies to This Discussion

Sorry, gang, I should have been more specific. I am building (very slowly) a 601XLB. Since this discussion is in the General section rather than model specific I should have mentioned that.

My weight discussion was based on the parts for that plane and also based on my memory of checking the relative weights quite a few years ago. Assuming my memory is correct (and I am in my 70's now so who knows....) the difference between the Zenith and Grove gear for the 601XL almost cut the weight of the gear in half.

So, to condition my earlier response, weight savings remark is based on an old memory and is specific to the 601XL. The rest I stand by - stronger alloy, optional gun drilled internal brake lines, less metal, be careful of messing with the heat treating, etc.

Hi Bob: Not a problem, my only concern is that when I publish something I try and do my best to have that information be as accurate as possible since it stays out there virtually forever and later is being mis-quoted as fact.

 Grove quotes the 601 gear at 32.2 pounds which is pretty much in line with the rest of the Zenith to Grove comparrison. I do agree with you on stronger alloy and optional gun drilling although this has the possibility of adding stress areas which could potentially lead to cracking (unlikly but possible). I personally would not powder coat the gear, not because of changing the temper which is in the 500 degree area and powder can be fully cured in the 350 degree range if you choose your powder carefully, but because the flexing of the gear has the potential to crack the powder.

As a plans builder I looked into building my own gear and the price of the gear from Zenair was $500.  The raw material would have been about $300 plus whatever I had to come up with to make the bends. In the end I just bought the gear from Zenair.

They have a video of the gear being drop tested which shows how much it can bend and return to shape along with how much energy it will absorb.  My concern with making the gear out of 7075 is how much of that energy will be transmitted to the air frame with the stiffer gear.  I don't know about how every one else is but not all of my landings are as smooth as they should be.  I don't want to be replacing metal that has been buckled from a landing that would have been absorbed with the 6061 gear.

Just my thought.


New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...


Weather Maps

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, power distribution panel, Approach Fast Stack harnesses, Dynon and Garmin avionics, and more.

Custom Upholstery Kits for your Zenith Aircraft:

Zenith Vinyl Upholstery Kits

Zenith Apparel from EAA:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

How to videos from

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit for the latest DVD titles.

Aircraft Insurance:


West Coast USA:

Transition Training:

Pro Builder Assistance

Pro Builder Assistance

Aircraft Spruce & Specialty for all your building and pilot supplies!

© 2019   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service